Johnson & Johnson's Covid-19 booster shot is 94% effective when administered two months after the first dose in the U.S., the company announced Tuesday, adding that the booster increases antibody levels four to six times higher than one shot alone.
A J&J booster dose given six months out from the first shot appears to be potentially even more protective against Covid, the company said, generating antibodies twelve-fold higher four weeks after the boost, regardless of age.
When given as a booster, the vaccine remained well-tolerated, with side effects generally consistent with those seen after the initial dose, according to J&J.
The 94% efficacy rate for the J&J booster shot is for the U.S., the company said.
Globally, a booster shot given about two months after the first dose is 75% effective against symptomatic infection, according to the company.
Johnson, Johnson's, Paul Stoffels, Biden, Stoffels
COVID, Food and Drug Administration, Moderna, Pfizer, FDA, Covid